DM120 Lecture 7 Outline of Last Lecture I Yarns Outline of Current Lecture II Twisted and Ply Yarns A Yarn Number system III Filament Spun Yarns IV Denier System V Yarn Count Systems Current Lecture Yarns are twisted to hold fabrics together Yarn is twisted clockwise for an S twist and twisted counter clockwise for a Z twist Twists are measured in turns per inch Ply yarns are stronger than singles when both are the same size 2 ply two single yarns 3 ply three single yarns 4 ply four single twists Yarn Numbering System relationship between unit length and weight of yarns reflects the diameter or thickness of a yarn Filament Yarns Denier system direct system weight per unit length Spun Yarns Yarn count system indirect system length per unit weight Denier System Weight per 9000 meters if weighed would equal 1 gram E g 235 denier a yarn in which 9000 meters if weighed would equal 235 grams Tex weight per 1000 meter E g 20 tex yarn in which 1000 meters would equal 20 grams Yarn Count System for spun yarns Cotton count c c cc Ne Nec the number of 840 yarns in 1 pound E g 2cc 2 X 840 1680 yards in 1 pound 1 5cc 1 5 X 840 1260 yards in 1 pound These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Worsted Count w c New the number of 560 yards in 1 pound e g 2 CC 2 X 560 1120 yards in 1 pound 1 5 c c 1 5 X 560 840 yards in 1 pound Ply yarn and single yarn equivalent number of single yarn in ply yarn number of ply count in single yarn yarn count system Denier of a single yarn in ply yarn X number of ply equivalent count in a single yarn denier system Filament Yarn What does 300 10 1 2Z filament yarn indicate Yarn of 300 denier in size Containing 10 filaments With TPI of Z twist
View Full Document
Unlocking...